A full characterization of Er3+-Yb3+ co-doped fiber amplifiers (EYDFA) is done by numerically solving the
simultaneous calculation of the rate and propagation equations considering the forward- and backward-amplified
spontaneous emissions (ASE ± ) propagation. The effect of erbium and ytterbium codoping concentrations on the
gain of the amplifier is evaluated. With optimal calculated parameters, a gain of 32.7 dB and a fiber length of 3.54
cm with pump and signal powers of 200 mWand 1 μW in optimal codoping concentrations is obtained.
Simulations have been done for gain characteristic and noise figure of an erbium-doped fiber amplifier (EDFA) with
parameters similar to EYDFA to compare the obtained results. The proposed model and simulation results are
validated with published experimental results.
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